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(No Model.) I 2 SheetsSheet 1.

H. J. MULLER.

ELECTRIC LAMP.

No. 249,387.- Patented N0v. 8,1881.

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IN VENTOR ATTORNEYS N. PETERS. i humlimu n hnr. Washington D. C,

ITNESSES I fi wa/ zz ,(No Model?) 2 Sheets -Sheet 2.

H. J. MUL ER.

8 ELECTRIC LAMP. No. 249,387. Patented Nov. 8,1881.

WITNESSES: INVENTOR ATTORN EYS N. FErERS. Plmllrl nwgnphnr, Washinginn. an

UNITED STATES PATENT QFFICE.

HANS J. MULLER, OF NEW YORK, N. Y., ASSIGNOR r0 HIMSELF AND ALEXANDER LEVETT, or sAME rLAoE.

ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 249,387, dated November 8, 1881,

Application filed April 9, 1881. (NomodeL) To all whom it may concern Be it known that I, HANs J. MtiLLEn, of the city, county, and State of New York, have invented anew and Improved Electric Lamp, of which the following is a specification.

The object of my invention is to provide new and improved devices for automatically adjusting the positions of the carbon sticks ofan electric lamp.

The invention consists in a grasping device attached to the hollow core of a helix, which core surrounds the upper carbon-holding rod, this grasping device being so constructed that it seizes the carbon-holding rod and raises it when the core is drawn into the helix by the force of the axial magnetism created in the helix by the electric current.

The invention further consists in an eccentric clamp provided with a locking device for holding the carbon-holding rod while inserting another stick.

The invention also consists in the arrangement of the several parts of the lamp for the purpose of adjusting the carbon sticks in such a manner that they will be directly opposite to each other.

In the accompanying drawings, Figure l is a cross-sectional elevation of the lower half of my improved electric lamp. Fig. 2is a crosssectional elevation of the upper half of the same. Fig. 3 is a plan view of the top of the cylinder. Fig. 4 is a plan view of the piston attached to the upper carbon holding rod. Fig. 5 is a plan view of the grasping arrangement attached to the core of the helix. Fig. 6 is a plan view of the eccentric clamp for holding the carbon-holding rod while inserting a fresh carbon stick. Fig. 7 is a detail view of part of the upper carbon-holding rod and the pin to prevent it from turning.

Similar letters of reference indicate correspondin g parts.

The tubular helixAis wound with insulated wire 13, and a hollow cylindrical or tubular armature or core, 0, fits in this helix, and the carbon-holding'rod D fits in this tubular core. The helix is attached at the upper end to the plate E, with an aperture for the rod D, and this plate is connected with a plate, F, some distance below the lower end of the helix, and also provided with an aperture for the rod D by a sheet of metal, G, or by a series of rods. Two rods, H H, are pivoted to the lower end 'attached to the lower end of means of a-ball-and-socket joint,X, or an analto be inclined as may be necessary,

of the core 0, at opposite sides, and the ends of these rods are the levers or dogs I, which are pivoted to a ring or collar, J. This ring is loosely mounted on the rod D and pivoted to the forked end ofa lever, K, which is pivoted to jaws L on the upper surface of the plate F. The outer end of this lever K is drawn upward by a spiral spring, M, attached to an adjustable screw, N, of the plate E. The levers I are of such length that their inner ends rest againstopposite sides of the rod D, as shown in Figs. 1 and 5.

O and P are adjusting-screws for adjusting the play of the lever K. The rod D is provided with a longitudinal groove, Q, into which a pin, R, of the plate F fits to prevent the rod D from turning. A cam-dog,S, provided with two notches, T T, is pivoted to the under side of the plate F adjoining the aperture for the rod D, and a locking-spring, U, with a projec lion resting against the cam dog S at the end, is riveted to the plate F. If the cam-dog is turned as shown in dotted lines, it will press against the rod D and will hold the same in any desired position. The carbon -h0lding clamp V, provided with a binding-screw, W,is the rod D by ogous universal joint, to permit theearbon Y according to theinclination of thelowercarbon,Y, which is held by a clamp, a, of the plate b, supported from the plate F by the rods d, insulated from to plate F by the washers e, of insulating ma terial. The glass globe f rests on the plate I), and is secured on the same by suitable screws. Acylinder, g, of the same length as the rod D, and closed by a plate, h, at the upper end, is attached to the top of the plate E. The top plate, h, is provided with a narrow slot, j, closed by a sliding plate, 70, pressed upon the top It by a spring, I, and attached to a screw, m, for moving it in the direction of the length of the slot j. A weighted valve, n, or a spring-valve closes an aperture, 0, in the top plate, h. A piston, 19, formed of top and bottom plates, t t, and a series of segments, q, mounted loosely on radial rodsrof the rod D and pressed outward by spiral springs s, is attached to the upper end of the rod D, this piston fitting closely in the cylinder g. I do not limit myself to this construction of the piston, although I prefer it, but may use any other close-fitting piston.

pivoted to the outer ends of The positive wire from an electric generator is attached to the lamp by the binding-screw a, and the negative wire is attached to the same by the binding-screw 10, connected with the helix A at O and insulated from the plate E by the washers y, of insulating material. One of the arms d is connected with the opposite end of the wire of the helix by a wire, A, passing through a small tube or collar of insulating material, B, in the plate F.

The ring J, described above, may be replaced by two plates pivoted to the ends of the lever K, and having the dogs or levers pivoted between them.

The operation is as follows: The current enters from the electric generator at the bindingscrew 10, passes through the cylinder g, piston 1), rod D, the positive carbon Y, to the negative carbon Y, the plate I), the rods or arms (I, the insulated wire A, the helix A, and the insulated binding-screw w, and the negative wire, back to the electric generator. The armature or core 0 is drawn into the helix A by the induced power, whereby the outer ends of the levers I are drawn upward by the rods H, and the inner ends of these levers I are pressed with considerable force against the carbonholding rod D, which is thus raised, as the levers I and the ring J to which they are pivoted are raised, with the core C, until the outer end of the lever K rests on the screw 1?. The are of the light is thus formed. As the carbons are gradually wasted the induced power of the helix A is decreased, and is finally overcome by the spring M, which draws the outer end of the lever K upward, and the ring described above, and which is pivoted to the forked end of the lever K, downward, thus releasing the carbon-holdin g rod D from the gripe of the levers I, and permitting the ring J to descend until the inner end of the lever K rests upon the screw 0; but as the carbon points have approached each other, the resistance has been decreased to such an extent that the helix regains its full eleetro-motive power and again raises the core, and consequently the carbon-holding rod D, 850., as described above. The screws or stops 0 and P are adjustable, and the former prevents the ring J from descending 'too far, whereas the latter prevents the carbons from being separated sufficiently to break the are. If the piston p is forced upward by the rod D, part of the air in the cylinder above the piston is forced out through the opening in the plate h, which opening is immediately closed by the weighted or spring valve '12. The piston and the carbonholder could thus not descend, for if they would they would form a vacuum above the piston, and their weight is not sufficient to do this. Therefore a small quantity of air is permitted to enter into the upper part of the cylinder to avoid the formation of a vacuum, and to permit the piston and carbon-holder to descend. If a small quantity of air is admitted the piston will descend very slowly, and if a larger quantity is admitted it will descend more rapidly.

The speed of the carbon-holder while descendin g can thus be adj usted by admitting a greater or less quantity of air into the upper part of the cylinder 9, which quantity of air can be regulated by means of the screw m, attached to the slide 7;. The carbon G is thus prevented from descending too rapidly, and the carbon points are thus protected from being broken and shattered. If the cam-dog S is turned as indicated in dotted lines in Fig. 6, it will be pressed against the rod D, and will hold the same in any desired position, and thus permits of inserting a carbon stick in the carbon-holding clamp V very conveniently.

By means of the ball-and-socketjoint X the carbon Y can be so adjusted that its point will be directly opposite the point of the carbon Y, thereby insuring a more perfect and uniform are than can be obtained if the carbon Y is rigidly attached to the carbon-holding rod. The ball X is held between the plate X on the under side of the rod D, and the two clampingplates X held to said plate X by the screws or rivets X Having thus fully described my invention, I claim as new and desire to secure by Letters Patent 1. In an electric la1np,the combination, with the helix-core and the carbon holder, of the rods H, pivoted to the core, of the levers I, pivoted to the rods H and to a ring, J, surrounding the carbon-holder and pivoted to a lever, K, pivoted to the frame of the lamp, and of a spring, M, for drawing or forcing the outer end of this lever K upward, substantially as herein shown and described, and for the purpose set forth.

2. In an electric lamp, the combination, with the carbon-holding rod, of a piston attached thereto, ot' a cylinder surrounding the carbonholding rod and in which the piston tits, of'an adjustable air-valve, and of an automatic airvalve in the top of this cylinder, substantially as herein shown and described, and for the purpose set forth.

3. In an electric lamp, the combination, with the carbon-holding rod D, of the piston 12, the cylinder g, provided with an aperture, 0, and a slot, j, in its top h, of the automatic valve a, the sliding plate 70, the spring I, and the screw on, substantially as herein shown and described, and for the purpose set forth.

4. In an electric lamp, the combination, with the carbon-holding rod D, of the cam-dog S, which is pivoted and notched, and a device for locking said dog, as shown and described.

5. In an electric lamp, the combination, with the carbon-holding rod D, of the cam-dog S, provided with notches TT and pivoted to the frame of the lamp, of a spring, U, attached to the frame of the lamp and resting against the cam-dog, substantially as herein shown and described, and for the purpose set forth.

HANS J. MULLER.

Witnesses:

OSCAR F. GUNZ, G. Snnewicx. 

